Lu Liang-Qiu, Cao Yi-Ju, Liu Xiao-Peng, An Jing, Yao Chang-Jiang, Ming Zhi-Hui, Xiao Wen-Jing. A new entry to cascade organocatalysis: reactions of stable sulfur ylides and nitroolefins sequentially catalyzed by thiourea and DMAP. Journal of the American Chemical Society, 2008, 130, 22, 6946-6948.
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http://dx.doi.org/10.1021/ja800746q